Not all bentonite clay is created equal. The way it’s processed can significantly impact its structure—and its ability to bind certain substances.
Highly processed clay may lose these natural properties, while less processed calcium montmorillonite bentonite clay retains the characteristics that define its functionality. This is the form used in our Mineral Toothpowder.
Here’s why.
1. Bentonite’s unique properties come from its natural structure.
Bentonite clay—especially calcium montmorillonite— is valued for its:
- High surface area
- Negative ionic charge
- Layered structure (called “smectite”), which allows it to adsorb substances between the layers
These properties enable it to adsorb (not absorb) positively charged substances, including certain metal ions such as heavy metals.
2. Excessive processing can damage this structure.
Here’s how:
Thermal treatment
Some industrial processes use high heat (e.g., for sterilization or drying), which can alter the clay’s crystal structure, reducing its surface area and weakening its charge.
Research has shown that thermal degradation can reduce cation exchange capacity (CEC) — a key measure of the clay’s binding capability.
Chemical treatments
To “purify” or “bleach” clay, manufacturers sometimes use acids or other chemicals. These treatments can:
- Strip natural minerals that contribute to its charge
- Reduce layer spacing
- Result in a less functionally active material
Particle over-refinement
Clay that’s been ground too fine or overly processed may lose some of the hydration and swelling characteristics that support its natural behavior.
3. Less processed = Functionally intact
In contrast, less processed, food-grade calcium montmorillonite bentonite clay retains:
- Its natural mineral profile
- Its electrical charge
- Its layered, swelling structure
In oral care applications, these properties influence how the material interacts within the mouth during brushing.
In short:
Calcium bentonite clay’s properties come from its structure and charge. When those are altered through aggressive processing, its functional characteristics may be reduced.
